Enhanced Interface Mechanics for Multimaterial FEM

Abstract

Multi-material Eulerian and arbitrary Lagrangian-Eulerian methods were originally developed for solving hypervelocity impact problems, but they are attractive for solving a broad range of problems having large deformations, the evolution of new free surfaces, and chemical reactions. The contact, separation, and slip between two surfaces have traditionally been addressed by the mixture theory, however the accuracy of this approach is severely limited. To improve the accuracy, an extended finite element formulation is developed and example calculations are presented. As a side benefit, the mixture theory is eliminated from the multi-material formulation, eliminating the issues associated with the equilibration time between adjacent materials. By design, the new formulation is relatively simple to implement in existing multi-material codes, parallelizes without difficulty, and has a low memory burden.

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Document Details

Document Type
Technical Report
Publication Date
Jun 06, 2007
Accession Number
ADB329044

Entities

People

  • David J. Benson

Organizations

  • University of California, San Diego

Tags

Communities of Interest

  • Energy and Power Technologies
  • Weapons Technologies

DTIC Thesaurus Topics

  • Abstracts
  • Agreements
  • Algorithms
  • Department Of Defense
  • Elastic Properties
  • Engineering
  • Equations
  • Finite Element Analysis
  • Governments
  • Materials
  • Mathematics
  • Mechanics
  • Standards
  • Strain Rate
  • Stratified Fluids
  • Students
  • Topology

Readers

  • Computational Fluid Dynamics (CFD)
  • Distributed Systems and Data Platform Development
  • Finite Element Method (FEM) for solving Partial Differential Equations (PDEs)

Technology Areas

  • Hypersonics
  • Hypersonics - Hypersonic Flight